PP2. Week 6: April 12 - 18
Complex numbers: addition and subtraction
Two complex numbers are given. Find their sum or difference.
Each line contains an example of addition or subtraction of complex numbers. The complex number is given in the format a+bi or a-bi, where a is integer, b is non-negative integer. The real and imaginary part of each complex number is no more than
109 by absolute value.
For each input example, print in a separate line the answer.
2+3i + 7-4i 12-4i - 5-4i -1-1i - -1-1i 5-2i - -7+12i
9-1i 7+0i 0+0i 12-14i